Inhomogeneity and anisotropy of the lithosphere for the territory of the U.S.S.R.

Physics

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Scientific paper

The DSS data obtained for the territory of the U.S.S.R. have shown some characteristic features in the distribution of the crustal and mantle inhomogeneities. The crustal thickness and average velocities in its consolidated part correlate with the geostructure age, its position relative to the continent margin, depth to the basement and the surface relief. A strong dependence is observed between the lithosphere structure and the heat flow: higher temperature regimes are accompanied by a thinner crust and lower uppermost mantle velocities. Thin layering and Q-factor structure are typical for the upper mantle of both tectonically active and stable regions. It is difficult to determine the lithosphere-asthenosphere system. The S waves give information on the VP/VS ratio and on seismic anisotropy derived from the splitting of differently polarized waves. The VP/VS value depends on the depth, the geostructure age and the temperature regime. The seismic anisotropy was observed more in the crust than in the mantle.

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